Franck-Condon factors and R-centroids for halogen molecules—III. The A3Π(1)- X1Σ + system of 79Br 81Br
New spectroscopic data for the vibrational and rotational constants of Br 2A3Π(1 u) have enabled a calculation of the first RKRV potential energy curve for this state to be made. A semi-empirical method for extrapolation of the rotational constants to the potential minimum is described. Franck-Condon factors and r-centroids for the A3Π(1)- X1Σ + system of 79Br 81Br are reported for the ranges of vibrational quantum number 0 ≦ v″ ≦ 23, 0 ≦ v' ≦ 28. An estimate for the radiative lifetime of the A state is reported.